Research Progress in Numerical Models on Gas-Solid Fluidization of Cohesive Particles
Research Progress in Numerical Models on Gas-Solid Fluidization of Cohesive Particles
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发表时间：
2014
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通讯作者：
Zhang Yong-ju
中科院分区：
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作者：
Zhang Yong-ju
粘性颗粒在流化过程中的团聚是由于颗粒间的作用力如货车范德华力、液桥力和静电力等，影响流化床反应器的正常运行。连续介质模型、离散颗粒模型和拟颗粒模型在研究团聚流化行为时各有优缺点。基于欧拉方法的连续介质模型无法描述粘性颗粒间的特定相互作用，而基于拉格朗日方法的数值模型在粘性颗粒流化的多尺度研究中，从力学分析、颗粒碰撞和团聚流动等方面显示出巨大的优势。然而，离散颗粒模型只能用于模拟有限数量的颗粒，而伪颗粒模型由于计算量巨大，仅适用于微尺度系统。随着高性能计算机的发展，拉格朗日方法将有广阔的应用前景。
The agglomeration of cohesive particles in fluidization process is due to the inter-particle forces such as van der Waals force, liquid bridging force and electrostatic force, which affects the normal operation of fluidized bed reactors. The continuum, discrete particle and pseudo-particle models have their advantages and disadvantages in investigation of the agglomerating fluidization behavior. The continuum model based on Eulerian method can not describe the specific interaction between cohesive particles, while the numerical model based on Lagrangian method shows great advantages in multi-scale studies on the fluidization of cohesive particles in terms of mechanic analysis, particle collision and agglomeration flow. However, the discrete particle model can only be used to simulate a finite number of particles and the pseudo-particle model only works well for the micro-scale systems, due to the tremendous amount of computing. With the development of high performance computers, the Lagrangian methods will have wide application prospects.